“supershear” earthquakes that move faster than seismic waves, producing shock fronts similar to sonic booms Normally, the rupture front in a typical quake moves slower than these waves These rare but powerful ruptures could unleash more violent shaking over wider areas than typical quakes, putting cities near major faults at risk
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Are supershear earthquakes even more dangerous than we thought
Supershear earthquakes, which cause intense shaking, are more common than once thought, posing a risk to california
New research urges updates to seismic forecasts and infrastructure assessments. The warning came while studying past earthquakes that struck california These are called supershear, a rare phenomenon, that move faster than seismic waves. Traditionally, it was thought that the rupturing of a fault moved more slowly than another type of damaging seismic wave, known as a shear wave
Generally speaking, shear waves cause a great deal of the destructive shaking power in an earthquake. What is a supershear earthquake Energy bunches up into a shock front, delivering an intense initial jolt—then the ongoing rupture drives prolonged shaking This “ double strike ” can be more damaging than in typical quakes of the same magnitude.
